Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e3aa316b8ef414…

MALICIOUS

PDF

33.3 KB Created: 2020-09-02 00:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 511422f62073d608c37ee72d9538864c SHA-1: 1a33256ae002f12e5aa90541d98f0e2318608977 SHA-256: 74e3aa316b8ef41412895a4f5f24dfce351a4672b22f9b82f099c5f58d59a54e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous external links suggests an attempt to lead the user to malicious content or to engage in SEO link farming for malicious purposes. No scripts were extracted, but the document's structure and link farm heuristic point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=bangalore+days+bike+racing+ringtone+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/check_my_current_address_dmv_california.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/data_binding_checkbox_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/98259051786.pdf
    • https://static.usrfiles.com/ugd/3eed2b_fe8b32d409bb4566babfb07d5a0f87df.pdf
    • https://static.usrfiles.com/ugd/b8c837_e17292eb6db1468bb6f5aa040c921649.pdf
    • https://static.usrfiles.com/ugd/b8c837_455508254f8b4f8782217f181e537766.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/59845312070.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/stihl_fs45_prices.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/95786956406.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1103/files/puzepifevimededirakoje.pdf
    • https://static.usrfiles.com/ugd/9d869b_62af5183612a40f797556304778d1644.pdf
    • https://static.usrfiles.com/ugd/68ec51_ab35cda74a624944b95ece61f68817cd.pdf
    • https://static.usrfiles.com/ugd/9df9d6_efc739e8fd714543831e901e058d12af.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004410.bin
0876b19ac8ef860f39f25f641f137547a586c380de4dc9b4507b06b9443d6be9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4410 5544 bytes
font_01_sfnt_off00005708.bin
3c8612f550d37456f2a65279134afaab35d99cc2ae71141d06edf0aded52736a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5708 9740 bytes